APA (7e ed.) Bronvermelding

Não informado. (2002). Canadian pit and quarry. National Business Publications.

Chicago (17e ed.) Bronvermelding

Não informado. Canadian Pit and Quarry. Gardenvale, Canada: National Business Publications, 2002.

MLA (8e ed.) Bronvermelding

Não informado. Canadian Pit and Quarry. National Business Publications, 2002.

Let op: Deze citaties zijn niet altijd 100% accuraat.